I have a QWidget with a QGraphicsView and a push button. The QGraphicsView has to take mouse press and release events to detect a swipe .At the same time push button should run a small function on clicked. I used an event filter in the QWidget to detect the mouse events.

Qt Code: 
  1. bool Widget::eventFilter(QObject * obj, QEvent * event)
  2. {
  3.  
  4.     // Capturing keyboard events for moving
  5.     if( event->type() == QEvent::KeyPress )
  6.     {
  7.         //Do something
  8.     }
  9.  
  10.     //Capturing mouse events for swipe
  11.     else if( event->type() == QEvent::MouseButtonPress)
  12.     {
  13.         QMouseEvent* mouseEvent = static_cast<QMouseEvent*> (event);
  14.         swipe_startPoint = mouseEvent->pos();
  15.     }
  16.  
  17.     else if( event->type() == QEvent::MouseButtonRelease)
  18.     {
  19.         QMouseEvent* mouseEvent = static_cast<QMouseEvent*> (event);
  20.         swipe_endPoint = mouseEvent->pos();
  21.         swipeDirection();
  22.     }
  23.  
  24.     else
  25.     {
  26.         QWidget::eventFilter(obj,event);
  27.     }
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In the constructor of the Widget class i have the following
Qt Code: 
  1. ui->graphicsView->installEventFilter(this);
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The problem is that the button is getting clicked but the MouseButtonRelease event that sets the 'swipe_endPoint' value is not working.

When i set
Qt Code: 
  1. ui->graphicsView->grabMouse();
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the mouse pressed and released events are working perfectly but the button stops accepting the events.

Note : Using QT 5.6.0 in Ubuntu

Can you please help me overcome this problem.
Thanks in advance